bonjour
je te montre
| x + 10 | = 3
| x + 10 | ≥ 0 ⇔ x + 10 ≥ 0 ⇔ x ≥ - 10
| x + 10 | ≤ 0 ⇔ - x - 10 ≤ 0 ⇔ - x ≤ 10 ⇔ x ≥ - 10
x - ∞ - 10 + ∞
| x + 10 | - x - 10 0 x + 10
- x - 10 = 3 ⇔ - x = 3 + 10 ⇔ - x = 13 ⇔ x = - 13
x + 10 = 3 ⇔ x = 3 - 10 ⇔ x = - 7
S ( - 13 ; - 7 )